[R-390] R-390 Audio Transformer

[Steve Hobensack]

An 18 volt filament transformer will do the same thing as the more expensive audio transformer. 120 to 18v is the ratio for maximum power transfer that I found experimentally.  Radio shack used to sell them. I don't know if they still do. I don't know about the frequency response though. I also compared it to a multi-tapped 70 volt line to voice coil transformer, and my ear couldn't tell the difference.
Steve N8YE